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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9ef80120d459648f2fae9fe4ce8c96d9b150d23ea04cc5a859ecc113700980b' 
  AND token = 'l37iJDrIwZ+qzhB9OfkkRjZJQf/rBo3EDdLyN17UbOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00114

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}